1 /*
   2  * Copyright (c) 1995, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.awt;
  27 
  28 import java.awt.datatransfer.Clipboard;
  29 import java.awt.dnd.DragGestureListener;
  30 import java.awt.dnd.DragGestureRecognizer;
  31 import java.awt.dnd.DragSource;
  32 import java.awt.event.*;
  33 import java.awt.im.InputMethodHighlight;
  34 import java.awt.image.ColorModel;
  35 import java.awt.image.ImageObserver;
  36 import java.awt.image.ImageProducer;
  37 import java.beans.PropertyChangeEvent;
  38 import java.beans.PropertyChangeListener;
  39 import java.beans.PropertyChangeSupport;
  40 import java.io.File;
  41 import java.io.FileInputStream;
  42 import java.net.URL;
  43 import java.util.ArrayList;
  44 import java.util.EventListener;
  45 import java.util.HashMap;
  46 import java.util.Map;
  47 import java.util.MissingResourceException;
  48 import java.util.Properties;
  49 import java.util.ResourceBundle;
  50 import java.util.StringTokenizer;
  51 import java.util.WeakHashMap;
  52 
  53 import sun.awt.AWTAccessor;
  54 import sun.awt.AWTPermissions;
  55 import sun.awt.AppContext;
  56 import sun.awt.HeadlessToolkit;
  57 import sun.awt.PeerEvent;
  58 import sun.awt.SunToolkit;
  59 
  60 import java.security.AccessController;
  61 import java.security.PrivilegedAction;
  62 import java.util.Arrays;
  63 import java.util.ServiceLoader;
  64 import java.util.Set;
  65 import java.util.stream.Collectors;
  66 import javax.accessibility.AccessibilityProvider;
  67 
  68 /**
  69  * This class is the abstract superclass of all actual
  70  * implementations of the Abstract Window Toolkit. Subclasses of
  71  * the {@code Toolkit} class are used to bind the various components
  72  * to particular native toolkit implementations.
  73  * <p>
  74  * Many GUI events may be delivered to user
  75  * asynchronously, if the opposite is not specified explicitly.
  76  * As well as
  77  * many GUI operations may be performed asynchronously.
  78  * This fact means that if the state of a component is set, and then
  79  * the state immediately queried, the returned value may not yet
  80  * reflect the requested change.  This behavior includes, but is not
  81  * limited to:
  82  * <ul>
  83  * <li>Scrolling to a specified position.
  84  * <br>For example, calling {@code ScrollPane.setScrollPosition}
  85  *     and then {@code getScrollPosition} may return an incorrect
  86  *     value if the original request has not yet been processed.
  87  *
  88  * <li>Moving the focus from one component to another.
  89  * <br>For more information, see
  90  * <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#transferTiming">Timing
  91  * Focus Transfers</a>, a section in
  92  * <a href="http://docs.oracle.com/javase/tutorial/uiswing/">The Swing
  93  * Tutorial</a>.
  94  *
  95  * <li>Making a top-level container visible.
  96  * <br>Calling {@code setVisible(true)} on a {@code Window},
  97  *     {@code Frame} or {@code Dialog} may occur
  98  *     asynchronously.
  99  *
 100  * <li>Setting the size or location of a top-level container.
 101  * <br>Calls to {@code setSize}, {@code setBounds} or
 102  *     {@code setLocation} on a {@code Window},
 103  *     {@code Frame} or {@code Dialog} are forwarded
 104  *     to the underlying window management system and may be
 105  *     ignored or modified.  See {@link java.awt.Window} for
 106  *     more information.
 107  * </ul>
 108  * <p>
 109  * Most applications should not call any of the methods in this
 110  * class directly. The methods defined by {@code Toolkit} are
 111  * the "glue" that joins the platform-independent classes in the
 112  * {@code java.awt} package with their counterparts in
 113  * {@code java.awt.peer}. Some methods defined by
 114  * {@code Toolkit} query the native operating system directly.
 115  *
 116  * @author      Sami Shaio
 117  * @author      Arthur van Hoff
 118  * @author      Fred Ecks
 119  * @since       1.0
 120  */
 121 public abstract class Toolkit {
 122 
 123     // The following method is called by the private method
 124     // <code>updateSystemColors</code> in <code>SystemColor</code>.
 125 
 126     /**
 127      * Fills in the integer array that is supplied as an argument
 128      * with the current system color values.
 129      *
 130      * @param     systemColors an integer array.
 131      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 132      * returns true
 133      * @see       java.awt.GraphicsEnvironment#isHeadless
 134      * @since     1.1
 135      */
 136     protected void loadSystemColors(int[] systemColors)
 137         throws HeadlessException {
 138         GraphicsEnvironment.checkHeadless();
 139     }
 140 
 141     /**
 142      * Controls whether the layout of Containers is validated dynamically
 143      * during resizing, or statically, after resizing is complete.
 144      * Use {@code isDynamicLayoutActive()} to detect if this feature enabled
 145      * in this program and is supported by this operating system
 146      * and/or window manager.
 147      * Note that this feature is supported not on all platforms, and
 148      * conversely, that this feature cannot be turned off on some platforms.
 149      * On these platforms where dynamic layout during resizing is not supported
 150      * (or is always supported), setting this property has no effect.
 151      * Note that this feature can be set or unset as a property of the
 152      * operating system or window manager on some platforms.  On such
 153      * platforms, the dynamic resize property must be set at the operating
 154      * system or window manager level before this method can take effect.
 155      * This method does not change support or settings of the underlying
 156      * operating system or
 157      * window manager.  The OS/WM support can be
 158      * queried using getDesktopProperty("awt.dynamicLayoutSupported") method.
 159      *
 160      * @param     dynamic  If true, Containers should re-layout their
 161      *            components as the Container is being resized.  If false,
 162      *            the layout will be validated after resizing is completed.
 163      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 164      *            returns true
 165      * @see       #isDynamicLayoutSet()
 166      * @see       #isDynamicLayoutActive()
 167      * @see       #getDesktopProperty(String propertyName)
 168      * @see       java.awt.GraphicsEnvironment#isHeadless
 169      * @since     1.4
 170      */
 171     public void setDynamicLayout(final boolean dynamic)
 172         throws HeadlessException {
 173         GraphicsEnvironment.checkHeadless();
 174         if (this != getDefaultToolkit()) {
 175             getDefaultToolkit().setDynamicLayout(dynamic);
 176         }
 177     }
 178 
 179     /**
 180      * Returns whether the layout of Containers is validated dynamically
 181      * during resizing, or statically, after resizing is complete.
 182      * Note: this method returns the value that was set programmatically;
 183      * it does not reflect support at the level of the operating system
 184      * or window manager for dynamic layout on resizing, or the current
 185      * operating system or window manager settings.  The OS/WM support can
 186      * be queried using getDesktopProperty("awt.dynamicLayoutSupported").
 187      *
 188      * @return    true if validation of Containers is done dynamically,
 189      *            false if validation is done after resizing is finished.
 190      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 191      *            returns true
 192      * @see       #setDynamicLayout(boolean dynamic)
 193      * @see       #isDynamicLayoutActive()
 194      * @see       #getDesktopProperty(String propertyName)
 195      * @see       java.awt.GraphicsEnvironment#isHeadless
 196      * @since     1.4
 197      */
 198     protected boolean isDynamicLayoutSet()
 199         throws HeadlessException {
 200         GraphicsEnvironment.checkHeadless();
 201 
 202         if (this != Toolkit.getDefaultToolkit()) {
 203             return Toolkit.getDefaultToolkit().isDynamicLayoutSet();
 204         } else {
 205             return false;
 206         }
 207     }
 208 
 209     /**
 210      * Returns whether dynamic layout of Containers on resize is
 211      * currently active (both set in program
 212      *( {@code isDynamicLayoutSet()} )
 213      *, and supported
 214      * by the underlying operating system and/or window manager).
 215      * If dynamic layout is currently inactive then Containers
 216      * re-layout their components when resizing is completed. As a result
 217      * the {@code Component.validate()} method will be invoked only
 218      * once per resize.
 219      * If dynamic layout is currently active then Containers
 220      * re-layout their components on every native resize event and
 221      * the {@code validate()} method will be invoked each time.
 222      * The OS/WM support can be queried using
 223      * the getDesktopProperty("awt.dynamicLayoutSupported") method.
 224      *
 225      * @return    true if dynamic layout of Containers on resize is
 226      *            currently active, false otherwise.
 227      * @exception HeadlessException if the GraphicsEnvironment.isHeadless()
 228      *            method returns true
 229      * @see       #setDynamicLayout(boolean dynamic)
 230      * @see       #isDynamicLayoutSet()
 231      * @see       #getDesktopProperty(String propertyName)
 232      * @see       java.awt.GraphicsEnvironment#isHeadless
 233      * @since     1.4
 234      */
 235     public boolean isDynamicLayoutActive()
 236         throws HeadlessException {
 237         GraphicsEnvironment.checkHeadless();
 238 
 239         if (this != Toolkit.getDefaultToolkit()) {
 240             return Toolkit.getDefaultToolkit().isDynamicLayoutActive();
 241         } else {
 242             return false;
 243         }
 244     }
 245 
 246     /**
 247      * Gets the size of the screen.  On systems with multiple displays, the
 248      * primary display is used.  Multi-screen aware display dimensions are
 249      * available from {@code GraphicsConfiguration} and
 250      * {@code GraphicsDevice}.
 251      * @return    the size of this toolkit's screen, in pixels.
 252      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 253      * returns true
 254      * @see       java.awt.GraphicsConfiguration#getBounds
 255      * @see       java.awt.GraphicsDevice#getDisplayMode
 256      * @see       java.awt.GraphicsEnvironment#isHeadless
 257      */
 258     public abstract Dimension getScreenSize()
 259         throws HeadlessException;
 260 
 261     /**
 262      * Returns the screen resolution in dots-per-inch.
 263      * @return    this toolkit's screen resolution, in dots-per-inch.
 264      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 265      * returns true
 266      * @see       java.awt.GraphicsEnvironment#isHeadless
 267      */
 268     public abstract int getScreenResolution()
 269         throws HeadlessException;
 270 
 271     /**
 272      * Gets the insets of the screen.
 273      * @param     gc a {@code GraphicsConfiguration}
 274      * @return    the insets of this toolkit's screen, in pixels.
 275      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 276      * returns true
 277      * @see       java.awt.GraphicsEnvironment#isHeadless
 278      * @since     1.4
 279      */
 280     public Insets getScreenInsets(GraphicsConfiguration gc)
 281         throws HeadlessException {
 282         GraphicsEnvironment.checkHeadless();
 283         if (this != Toolkit.getDefaultToolkit()) {
 284             return Toolkit.getDefaultToolkit().getScreenInsets(gc);
 285         } else {
 286             return new Insets(0, 0, 0, 0);
 287         }
 288     }
 289 
 290     /**
 291      * Determines the color model of this toolkit's screen.
 292      * <p>
 293      * {@code ColorModel} is an abstract class that
 294      * encapsulates the ability to translate between the
 295      * pixel values of an image and its red, green, blue,
 296      * and alpha components.
 297      * <p>
 298      * This toolkit method is called by the
 299      * {@code getColorModel} method
 300      * of the {@code Component} class.
 301      * @return    the color model of this toolkit's screen.
 302      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 303      * returns true
 304      * @see       java.awt.GraphicsEnvironment#isHeadless
 305      * @see       java.awt.image.ColorModel
 306      * @see       java.awt.Component#getColorModel
 307      */
 308     public abstract ColorModel getColorModel()
 309         throws HeadlessException;
 310 
 311     /**
 312      * Returns the names of the available fonts in this toolkit.<p>
 313      * For 1.1, the following font names are deprecated (the replacement
 314      * name follows):
 315      * <ul>
 316      * <li>TimesRoman (use Serif)
 317      * <li>Helvetica (use SansSerif)
 318      * <li>Courier (use Monospaced)
 319      * </ul><p>
 320      * The ZapfDingbats fontname is also deprecated in 1.1 but the characters
 321      * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports
 322      * those characters.
 323      * @return    the names of the available fonts in this toolkit.
 324      * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()}
 325      * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()
 326      */
 327     @Deprecated
 328     public abstract String[] getFontList();
 329 
 330     /**
 331      * Gets the screen device metrics for rendering of the font.
 332      * @param     font   a font
 333      * @return    the screen metrics of the specified font in this toolkit
 334      * @deprecated  As of JDK version 1.2, replaced by the {@code Font}
 335      *          method {@code getLineMetrics}.
 336      * @see java.awt.font.LineMetrics
 337      * @see java.awt.Font#getLineMetrics
 338      * @see java.awt.GraphicsEnvironment#getScreenDevices
 339      */
 340     @Deprecated
 341     public abstract FontMetrics getFontMetrics(Font font);
 342 
 343     /**
 344      * Synchronizes this toolkit's graphics state. Some window systems
 345      * may do buffering of graphics events.
 346      * <p>
 347      * This method ensures that the display is up-to-date. It is useful
 348      * for animation.
 349      */
 350     public abstract void sync();
 351 
 352     /**
 353      * The default toolkit.
 354      */
 355     private static Toolkit toolkit;
 356 
 357     /**
 358      * Used internally by the assistive technologies functions; set at
 359      * init time and used at load time
 360      */
 361     private static String atNames;
 362 
 363     /**
 364      * Initializes properties related to assistive technologies.
 365      * These properties are used both in the loadAssistiveProperties()
 366      * function below, as well as other classes in the jdk that depend
 367      * on the properties (such as the use of the screen_magnifier_present
 368      * property in Java2D hardware acceleration initialization).  The
 369      * initialization of the properties must be done before the platform-
 370      * specific Toolkit class is instantiated so that all necessary
 371      * properties are set up properly before any classes dependent upon them
 372      * are initialized.
 373      */
 374     private static void initAssistiveTechnologies() {
 375 
 376         // Get accessibility properties
 377         final String sep = File.separator;
 378         final Properties properties = new Properties();
 379 
 380 
 381         atNames = java.security.AccessController.doPrivileged(
 382             new java.security.PrivilegedAction<String>() {
 383             public String run() {
 384 
 385                 // Try loading the per-user accessibility properties file.
 386                 try {
 387                     File propsFile = new File(
 388                       System.getProperty("user.home") +
 389                       sep + ".accessibility.properties");
 390                     FileInputStream in =
 391                         new FileInputStream(propsFile);
 392 
 393                     // Inputstream has been buffered in Properties class
 394                     properties.load(in);
 395                     in.close();
 396                 } catch (Exception e) {
 397                     // Per-user accessibility properties file does not exist
 398                 }
 399 
 400                 // Try loading the system-wide accessibility properties
 401                 // file only if a per-user accessibility properties
 402                 // file does not exist or is empty.
 403                 if (properties.size() == 0) {
 404                     try {
 405                         File propsFile = new File(
 406                             System.getProperty("java.home") + sep + "conf" +
 407                             sep + "accessibility.properties");
 408                         FileInputStream in =
 409                             new FileInputStream(propsFile);
 410 
 411                         // Inputstream has been buffered in Properties class
 412                         properties.load(in);
 413                         in.close();
 414                     } catch (Exception e) {
 415                         // System-wide accessibility properties file does
 416                         // not exist;
 417                     }
 418                 }
 419 
 420                 // Get whether a screen magnifier is present.  First check
 421                 // the system property and then check the properties file.
 422                 String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present");
 423                 if (magPresent == null) {
 424                     magPresent = properties.getProperty("screen_magnifier_present", null);
 425                     if (magPresent != null) {
 426                         System.setProperty("javax.accessibility.screen_magnifier_present", magPresent);
 427                     }
 428                 }
 429 
 430                 // Get the names of any assistive technologies to load.  First
 431                 // check the system property and then check the properties
 432                 // file.
 433                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 434                 if (classNames == null) {
 435                     classNames = properties.getProperty("assistive_technologies", null);
 436                     if (classNames != null) {
 437                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 438                     }
 439                 }
 440                 return classNames;
 441             }
 442         });
 443     }
 444 
 445     /**
 446      * Rethrow the AWTError but include the cause.
 447      *
 448      * @param s the error message
 449      * @param e the original exception
 450      * @throws the new AWTError including the cause (the original exception)
 451      */
 452     private static void newAWTError(Throwable e, String s) {
 453         AWTError newAWTError = new AWTError(s);
 454         newAWTError.initCause(e);
 455         throw newAWTError;
 456     }
 457 
 458     /**
 459      * When a service provider for Assistive Technology is not found look for a
 460      * supporting class on the class path and instantiate it.
 461      *
 462      * @param atName the name of the class to be loaded
 463      */
 464     private static void fallbackToLoadClassForAT(String atName) {
 465         try {
 466             Class<?> c = Class.forName(atName, false, ClassLoader.getSystemClassLoader());
 467             c.newInstance();
 468         } catch (ClassNotFoundException e) {
 469             newAWTError(e, "Assistive Technology not found: " + atName);
 470         } catch (InstantiationException e) {
 471             newAWTError(e, "Could not instantiate Assistive Technology: " + atName);
 472         } catch (IllegalAccessException e) {
 473             newAWTError(e, "Could not access Assistive Technology: " + atName);
 474         } catch (Exception e) {
 475             newAWTError(e, "Error trying to install Assistive Technology: " + atName);
 476         }
 477     }
 478 
 479     /**
 480      * Loads accessibility support using the property assistive_technologies.
 481      * The form is assistive_technologies= followed by a comma-separated list of
 482      * assistive technology providers to load.  The order in which providers are
 483      * loaded is determined by the order in which the ServiceLoader discovers
 484      * implementations of the AccessibilityProvider interface, not by the order
 485      * of provider names in the property list.  When a provider is found its
 486      * accessibility implementation will be started by calling the provider's
 487      * activate method.  All errors are handled via an AWTError exception.
 488      */
 489     private static void loadAssistiveTechnologies() {
 490         // Load any assistive technologies
 491         if (atNames != null) {
 492             ClassLoader cl = ClassLoader.getSystemClassLoader();
 493             Set<String> names = Arrays.stream(atNames.split(","))
 494                                       .map(String::trim)
 495                                       .collect(Collectors.toSet());
 496             final Map<String, AccessibilityProvider> providers = new HashMap<>();
 497             AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
 498                 try {
 499                     for (AccessibilityProvider p : ServiceLoader.load(AccessibilityProvider.class, cl)) {
 500                         String name = p.getName();
 501                         if (names.contains(name) && !providers.containsKey(name)) {
 502                             p.activate();
 503                             providers.put(name, p);
 504                         }
 505                     }
 506                 } catch (java.util.ServiceConfigurationError | Exception e) {
 507                     newAWTError(e, "Could not load or activate service provider");
 508                 }
 509                 return null;
 510             });
 511             names.stream()
 512                  .filter(n -> !providers.containsKey(n))
 513                  .forEach(Toolkit::fallbackToLoadClassForAT);
 514         }
 515     }
 516 
 517     /**
 518      * Gets the default toolkit.
 519      * <p>
 520      * If a system property named {@code "java.awt.headless"} is set
 521      * to {@code true} then the headless implementation
 522      * of {@code Toolkit} is used,
 523      * otherwise the default platform-specific implementation of
 524      * {@code Toolkit} is used.
 525      * <p>
 526      * If this Toolkit is not a headless implementation and if they exist, service
 527      * providers of {@link javax.accessibility.AccessibilityProvider} will be loaded
 528      * if specified by the system property
 529      * {@code javax.accessibility.assistive_technologies}.
 530      * <p>
 531      * An example of setting this property is to invoke Java with
 532      * {@code -Djavax.accessibility.assistive_technologies=MyServiceProvider}.
 533      * In addition to MyServiceProvider other service providers can be specified
 534      * using a comma separated list.  Service providers are loaded after the AWT
 535      * toolkit is created. All errors are handled via an AWTError exception.
 536      * <p>
 537      * The names specified in the assistive_technologies property are used to query
 538      * each service provider implementation.  If the requested name matches the
 539      * {@linkplain AccessibilityProvider#getName name} of the service provider, the
 540      * {@link AccessibilityProvider#activate} method will be invoked to activate the
 541      * matching service provider.
 542      *
 543      * @implSpec
 544      * If assistive technology service providers are not specified with a system
 545      * property this implementation will look in a properties file located as follows:
 546      * <ul>
 547      * <li> {@code ${user.home}/.accessibility.properties}
 548      * <li> {@code ${java.home}/conf/accessibility.properties}
 549      * </ul>
 550      * Only the first of these files to be located will be consulted.  The requested
 551      * service providers are specified by setting the {@code assistive_technologies=}
 552      * property.  A single provider or a comma separated list of providers can be
 553      * specified.
 554      *
 555      * @return     the default toolkit.
 556      * @exception  AWTError  if a toolkit could not be found, or
 557      *                 if one could not be accessed or instantiated.
 558      * @see java.util.ServiceLoader
 559      * @see javax.accessibility.AccessibilityProvider
 560      */
 561     public static synchronized Toolkit getDefaultToolkit() {
 562         if (toolkit == null) {
 563             java.security.AccessController.doPrivileged(
 564                     new java.security.PrivilegedAction<Void>() {
 565                 public Void run() {
 566                     Class<?> cls = null;
 567                     String nm = System.getProperty("awt.toolkit");
 568                     try {
 569                         cls = Class.forName(nm);
 570                     } catch (ClassNotFoundException e) {
 571                         ClassLoader cl = ClassLoader.getSystemClassLoader();
 572                         if (cl != null) {
 573                             try {
 574                                 cls = cl.loadClass(nm);
 575                             } catch (final ClassNotFoundException ignored) {
 576                                 throw new AWTError("Toolkit not found: " + nm);
 577                             }
 578                         }
 579                     }
 580                     try {
 581                         if (cls != null) {
 582                             toolkit = (Toolkit)cls.newInstance();
 583                             if (GraphicsEnvironment.isHeadless()) {
 584                                 toolkit = new HeadlessToolkit(toolkit);
 585                             }
 586                         }
 587                     } catch (final InstantiationException ignored) {
 588                         throw new AWTError("Could not instantiate Toolkit: " + nm);
 589                     } catch (final IllegalAccessException ignored) {
 590                         throw new AWTError("Could not access Toolkit: " + nm);
 591                     }
 592                     return null;
 593                 }
 594             });
 595             if (!GraphicsEnvironment.isHeadless()) {
 596                 loadAssistiveTechnologies();
 597             }
 598         }
 599         return toolkit;
 600     }
 601 
 602     /**
 603      * Returns an image which gets pixel data from the specified file,
 604      * whose format can be either GIF, JPEG or PNG.
 605      * The underlying toolkit attempts to resolve multiple requests
 606      * with the same filename to the same returned Image.
 607      * <p>
 608      * Since the mechanism required to facilitate this sharing of
 609      * {@code Image} objects may continue to hold onto images
 610      * that are no longer in use for an indefinite period of time,
 611      * developers are encouraged to implement their own caching of
 612      * images by using the {@link #createImage(java.lang.String) createImage}
 613      * variant wherever available.
 614      * If the image data contained in the specified file changes,
 615      * the {@code Image} object returned from this method may
 616      * still contain stale information which was loaded from the
 617      * file after a prior call.
 618      * Previously loaded image data can be manually discarded by
 619      * calling the {@link Image#flush flush} method on the
 620      * returned {@code Image}.
 621      * <p>
 622      * This method first checks if there is a security manager installed.
 623      * If so, the method calls the security manager's
 624      * {@code checkRead} method with the file specified to ensure
 625      * that the access to the image is allowed.
 626      * @param     filename   the name of a file containing pixel data
 627      *                         in a recognized file format.
 628      * @return    an image which gets its pixel data from
 629      *                         the specified file.
 630      * @throws SecurityException  if a security manager exists and its
 631      *                            checkRead method doesn't allow the operation.
 632      * @see #createImage(java.lang.String)
 633      */
 634     public abstract Image getImage(String filename);
 635 
 636     /**
 637      * Returns an image which gets pixel data from the specified URL.
 638      * The pixel data referenced by the specified URL must be in one
 639      * of the following formats: GIF, JPEG or PNG.
 640      * The underlying toolkit attempts to resolve multiple requests
 641      * with the same URL to the same returned Image.
 642      * <p>
 643      * Since the mechanism required to facilitate this sharing of
 644      * {@code Image} objects may continue to hold onto images
 645      * that are no longer in use for an indefinite period of time,
 646      * developers are encouraged to implement their own caching of
 647      * images by using the {@link #createImage(java.net.URL) createImage}
 648      * variant wherever available.
 649      * If the image data stored at the specified URL changes,
 650      * the {@code Image} object returned from this method may
 651      * still contain stale information which was fetched from the
 652      * URL after a prior call.
 653      * Previously loaded image data can be manually discarded by
 654      * calling the {@link Image#flush flush} method on the
 655      * returned {@code Image}.
 656      * <p>
 657      * This method first checks if there is a security manager installed.
 658      * If so, the method calls the security manager's
 659      * {@code checkPermission} method with the
 660      * url.openConnection().getPermission() permission to ensure
 661      * that the access to the image is allowed. For compatibility
 662      * with pre-1.2 security managers, if the access is denied with
 663      * {@code FilePermission} or {@code SocketPermission},
 664      * the method throws the {@code SecurityException}
 665      * if the corresponding 1.1-style SecurityManager.checkXXX method
 666      * also denies permission.
 667      * @param     url   the URL to use in fetching the pixel data.
 668      * @return    an image which gets its pixel data from
 669      *                         the specified URL.
 670      * @throws SecurityException  if a security manager exists and its
 671      *                            checkPermission method doesn't allow
 672      *                            the operation.
 673      * @see #createImage(java.net.URL)
 674      */
 675     public abstract Image getImage(URL url);
 676 
 677     /**
 678      * Returns an image which gets pixel data from the specified file.
 679      * The returned Image is a new object which will not be shared
 680      * with any other caller of this method or its getImage variant.
 681      * <p>
 682      * This method first checks if there is a security manager installed.
 683      * If so, the method calls the security manager's
 684      * {@code checkRead} method with the specified file to ensure
 685      * that the image creation is allowed.
 686      * @param     filename   the name of a file containing pixel data
 687      *                         in a recognized file format.
 688      * @return    an image which gets its pixel data from
 689      *                         the specified file.
 690      * @throws SecurityException  if a security manager exists and its
 691      *                            checkRead method doesn't allow the operation.
 692      * @see #getImage(java.lang.String)
 693      */
 694     public abstract Image createImage(String filename);
 695 
 696     /**
 697      * Returns an image which gets pixel data from the specified URL.
 698      * The returned Image is a new object which will not be shared
 699      * with any other caller of this method or its getImage variant.
 700      * <p>
 701      * This method first checks if there is a security manager installed.
 702      * If so, the method calls the security manager's
 703      * {@code checkPermission} method with the
 704      * url.openConnection().getPermission() permission to ensure
 705      * that the image creation is allowed. For compatibility
 706      * with pre-1.2 security managers, if the access is denied with
 707      * {@code FilePermission} or {@code SocketPermission},
 708      * the method throws {@code SecurityException}
 709      * if the corresponding 1.1-style SecurityManager.checkXXX method
 710      * also denies permission.
 711      * @param     url   the URL to use in fetching the pixel data.
 712      * @return    an image which gets its pixel data from
 713      *                         the specified URL.
 714      * @throws SecurityException  if a security manager exists and its
 715      *                            checkPermission method doesn't allow
 716      *                            the operation.
 717      * @see #getImage(java.net.URL)
 718      */
 719     public abstract Image createImage(URL url);
 720 
 721     /**
 722      * Prepares an image for rendering.
 723      * <p>
 724      * If the values of the width and height arguments are both
 725      * {@code -1}, this method prepares the image for rendering
 726      * on the default screen; otherwise, this method prepares an image
 727      * for rendering on the default screen at the specified width and height.
 728      * <p>
 729      * The image data is downloaded asynchronously in another thread,
 730      * and an appropriately scaled screen representation of the image is
 731      * generated.
 732      * <p>
 733      * This method is called by components {@code prepareImage}
 734      * methods.
 735      * <p>
 736      * Information on the flags returned by this method can be found
 737      * with the definition of the {@code ImageObserver} interface.
 738 
 739      * @param     image      the image for which to prepare a
 740      *                           screen representation.
 741      * @param     width      the width of the desired screen
 742      *                           representation, or {@code -1}.
 743      * @param     height     the height of the desired screen
 744      *                           representation, or {@code -1}.
 745      * @param     observer   the {@code ImageObserver}
 746      *                           object to be notified as the
 747      *                           image is being prepared.
 748      * @return    {@code true} if the image has already been
 749      *                 fully prepared; {@code false} otherwise.
 750      * @see       java.awt.Component#prepareImage(java.awt.Image,
 751      *                 java.awt.image.ImageObserver)
 752      * @see       java.awt.Component#prepareImage(java.awt.Image,
 753      *                 int, int, java.awt.image.ImageObserver)
 754      * @see       java.awt.image.ImageObserver
 755      */
 756     public abstract boolean prepareImage(Image image, int width, int height,
 757                                          ImageObserver observer);
 758 
 759     /**
 760      * Indicates the construction status of a specified image that is
 761      * being prepared for display.
 762      * <p>
 763      * If the values of the width and height arguments are both
 764      * {@code -1}, this method returns the construction status of
 765      * a screen representation of the specified image in this toolkit.
 766      * Otherwise, this method returns the construction status of a
 767      * scaled representation of the image at the specified width
 768      * and height.
 769      * <p>
 770      * This method does not cause the image to begin loading.
 771      * An application must call {@code prepareImage} to force
 772      * the loading of an image.
 773      * <p>
 774      * This method is called by the component's {@code checkImage}
 775      * methods.
 776      * <p>
 777      * Information on the flags returned by this method can be found
 778      * with the definition of the {@code ImageObserver} interface.
 779      * @param     image   the image whose status is being checked.
 780      * @param     width   the width of the scaled version whose status is
 781      *                 being checked, or {@code -1}.
 782      * @param     height  the height of the scaled version whose status
 783      *                 is being checked, or {@code -1}.
 784      * @param     observer   the {@code ImageObserver} object to be
 785      *                 notified as the image is being prepared.
 786      * @return    the bitwise inclusive <strong>OR</strong> of the
 787      *                 {@code ImageObserver} flags for the
 788      *                 image data that is currently available.
 789      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
 790      *                 int, int, java.awt.image.ImageObserver)
 791      * @see       java.awt.Component#checkImage(java.awt.Image,
 792      *                 java.awt.image.ImageObserver)
 793      * @see       java.awt.Component#checkImage(java.awt.Image,
 794      *                 int, int, java.awt.image.ImageObserver)
 795      * @see       java.awt.image.ImageObserver
 796      */
 797     public abstract int checkImage(Image image, int width, int height,
 798                                    ImageObserver observer);
 799 
 800     /**
 801      * Creates an image with the specified image producer.
 802      * @param     producer the image producer to be used.
 803      * @return    an image with the specified image producer.
 804      * @see       java.awt.Image
 805      * @see       java.awt.image.ImageProducer
 806      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
 807      */
 808     public abstract Image createImage(ImageProducer producer);
 809 
 810     /**
 811      * Creates an image which decodes the image stored in the specified
 812      * byte array.
 813      * <p>
 814      * The data must be in some image format, such as GIF or JPEG,
 815      * that is supported by this toolkit.
 816      * @param     imagedata   an array of bytes, representing
 817      *                         image data in a supported image format.
 818      * @return    an image.
 819      * @since     1.1
 820      */
 821     public Image createImage(byte[] imagedata) {
 822         return createImage(imagedata, 0, imagedata.length);
 823     }
 824 
 825     /**
 826      * Creates an image which decodes the image stored in the specified
 827      * byte array, and at the specified offset and length.
 828      * The data must be in some image format, such as GIF or JPEG,
 829      * that is supported by this toolkit.
 830      * @param     imagedata   an array of bytes, representing
 831      *                         image data in a supported image format.
 832      * @param     imageoffset  the offset of the beginning
 833      *                         of the data in the array.
 834      * @param     imagelength  the length of the data in the array.
 835      * @return    an image.
 836      * @since     1.1
 837      */
 838     public abstract Image createImage(byte[] imagedata,
 839                                       int imageoffset,
 840                                       int imagelength);
 841 
 842     /**
 843      * Gets a {@code PrintJob} object which is the result of initiating
 844      * a print operation on the toolkit's platform.
 845      * <p>
 846      * Each actual implementation of this method should first check if there
 847      * is a security manager installed. If there is, the method should call
 848      * the security manager's {@code checkPrintJobAccess} method to
 849      * ensure initiation of a print operation is allowed. If the default
 850      * implementation of {@code checkPrintJobAccess} is used (that is,
 851      * that method is not overriden), then this results in a call to the
 852      * security manager's {@code checkPermission} method with a
 853      * {@code RuntimePermission("queuePrintJob")} permission.
 854      *
 855      * @param   frame the parent of the print dialog. May not be null.
 856      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 857      *          to "".
 858      * @param   props a Properties object containing zero or more properties.
 859      *          Properties are not standardized and are not consistent across
 860      *          implementations. Because of this, PrintJobs which require job
 861      *          and page control should use the version of this function which
 862      *          takes JobAttributes and PageAttributes objects. This object
 863      *          may be updated to reflect the user's job choices on exit. May
 864      *          be null.
 865      * @return  a {@code PrintJob} object, or {@code null} if the
 866      *          user cancelled the print job.
 867      * @throws  NullPointerException if frame is null
 868      * @throws  SecurityException if this thread is not allowed to initiate a
 869      *          print job request
 870      * @see     java.awt.GraphicsEnvironment#isHeadless
 871      * @see     java.awt.PrintJob
 872      * @see     java.lang.RuntimePermission
 873      * @since   1.1
 874      */
 875     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
 876                                          Properties props);
 877 
 878     /**
 879      * Gets a {@code PrintJob} object which is the result of initiating
 880      * a print operation on the toolkit's platform.
 881      * <p>
 882      * Each actual implementation of this method should first check if there
 883      * is a security manager installed. If there is, the method should call
 884      * the security manager's {@code checkPrintJobAccess} method to
 885      * ensure initiation of a print operation is allowed. If the default
 886      * implementation of {@code checkPrintJobAccess} is used (that is,
 887      * that method is not overriden), then this results in a call to the
 888      * security manager's {@code checkPermission} method with a
 889      * {@code RuntimePermission("queuePrintJob")} permission.
 890      *
 891      * @param   frame the parent of the print dialog. May not be null.
 892      * @param   jobtitle the title of the PrintJob. A null title is equivalent
 893      *          to "".
 894      * @param   jobAttributes a set of job attributes which will control the
 895      *          PrintJob. The attributes will be updated to reflect the user's
 896      *          choices as outlined in the JobAttributes documentation. May be
 897      *          null.
 898      * @param   pageAttributes a set of page attributes which will control the
 899      *          PrintJob. The attributes will be applied to every page in the
 900      *          job. The attributes will be updated to reflect the user's
 901      *          choices as outlined in the PageAttributes documentation. May be
 902      *          null.
 903      * @return  a {@code PrintJob} object, or {@code null} if the
 904      *          user cancelled the print job.
 905      * @throws  NullPointerException if frame is null
 906      * @throws  IllegalArgumentException if pageAttributes specifies differing
 907      *          cross feed and feed resolutions. Also if this thread has
 908      *          access to the file system and jobAttributes specifies
 909      *          print to file, and the specified destination file exists but
 910      *          is a directory rather than a regular file, does not exist but
 911      *          cannot be created, or cannot be opened for any other reason.
 912      *          However in the case of print to file, if a dialog is also
 913      *          requested to be displayed then the user will be given an
 914      *          opportunity to select a file and proceed with printing.
 915      *          The dialog will ensure that the selected output file
 916      *          is valid before returning from this method.
 917      * @throws  SecurityException if this thread is not allowed to initiate a
 918      *          print job request, or if jobAttributes specifies print to file,
 919      *          and this thread is not allowed to access the file system
 920      * @see     java.awt.PrintJob
 921      * @see     java.awt.GraphicsEnvironment#isHeadless
 922      * @see     java.lang.RuntimePermission
 923      * @see     java.awt.JobAttributes
 924      * @see     java.awt.PageAttributes
 925      * @since   1.3
 926      */
 927     public PrintJob getPrintJob(Frame frame, String jobtitle,
 928                                 JobAttributes jobAttributes,
 929                                 PageAttributes pageAttributes) {
 930         // Override to add printing support with new job/page control classes
 931 
 932         if (this != Toolkit.getDefaultToolkit()) {
 933             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
 934                                                            jobAttributes,
 935                                                            pageAttributes);
 936         } else {
 937             return getPrintJob(frame, jobtitle, null);
 938         }
 939     }
 940 
 941     /**
 942      * Emits an audio beep depending on native system settings and hardware
 943      * capabilities.
 944      * @since     1.1
 945      */
 946     public abstract void beep();
 947 
 948     /**
 949      * Gets the singleton instance of the system Clipboard which interfaces
 950      * with clipboard facilities provided by the native platform. This
 951      * clipboard enables data transfer between Java programs and native
 952      * applications which use native clipboard facilities.
 953      * <p>
 954      * In addition to any and all default formats text returned by the system
 955      * Clipboard's {@code getTransferData()} method is available in the
 956      * following flavors:
 957      * <ul>
 958      * <li>DataFlavor.stringFlavor</li>
 959      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
 960      * </ul>
 961      * As with {@code java.awt.datatransfer.StringSelection}, if the
 962      * requested flavor is {@code DataFlavor.plainTextFlavor}, or an
 963      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
 964      * the system Clipboard's {@code getTransferData()} method for
 965      * {@code DataFlavor.plainTextFlavor}, and equivalent DataFlavors, is
 966      * inconsistent with the definition of {@code DataFlavor.plainTextFlavor}.
 967      * Because of this, support for
 968      * {@code DataFlavor.plainTextFlavor}, and equivalent flavors, is
 969      * <b>deprecated</b>.
 970      * <p>
 971      * Each actual implementation of this method should first check if there
 972      * is a security manager installed. If there is, the method should call
 973      * the security manager's {@link SecurityManager#checkPermission
 974      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
 975      *
 976      * @return    the system Clipboard
 977      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 978      * returns true
 979      * @see       java.awt.GraphicsEnvironment#isHeadless
 980      * @see       java.awt.datatransfer.Clipboard
 981      * @see       java.awt.datatransfer.StringSelection
 982      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
 983      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
 984      * @see       java.io.Reader
 985      * @see       java.awt.AWTPermission
 986      * @since     1.1
 987      */
 988     public abstract Clipboard getSystemClipboard()
 989         throws HeadlessException;
 990 
 991     /**
 992      * Gets the singleton instance of the system selection as a
 993      * {@code Clipboard} object. This allows an application to read and
 994      * modify the current, system-wide selection.
 995      * <p>
 996      * An application is responsible for updating the system selection whenever
 997      * the user selects text, using either the mouse or the keyboard.
 998      * Typically, this is implemented by installing a
 999      * {@code FocusListener} on all {@code Component}s which support
1000      * text selection, and, between {@code FOCUS_GAINED} and
1001      * {@code FOCUS_LOST} events delivered to that {@code Component},
1002      * updating the system selection {@code Clipboard} when the selection
1003      * changes inside the {@code Component}. Properly updating the system
1004      * selection ensures that a Java application will interact correctly with
1005      * native applications and other Java applications running simultaneously
1006      * on the system. Note that {@code java.awt.TextComponent} and
1007      * {@code javax.swing.text.JTextComponent} already adhere to this
1008      * policy. When using these classes, and their subclasses, developers need
1009      * not write any additional code.
1010      * <p>
1011      * Some platforms do not support a system selection {@code Clipboard}.
1012      * On those platforms, this method will return {@code null}. In such a
1013      * case, an application is absolved from its responsibility to update the
1014      * system selection {@code Clipboard} as described above.
1015      * <p>
1016      * Each actual implementation of this method should first check if there
1017      * is a security manager installed. If there is, the method should call
1018      * the security manager's {@link SecurityManager#checkPermission
1019      * checkPermission} method to check {@code AWTPermission("accessClipboard")}.
1020      *
1021      * @return the system selection as a {@code Clipboard}, or
1022      *         {@code null} if the native platform does not support a
1023      *         system selection {@code Clipboard}
1024      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1025      *            returns true
1026      *
1027      * @see java.awt.datatransfer.Clipboard
1028      * @see java.awt.event.FocusListener
1029      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1030      * @see java.awt.event.FocusEvent#FOCUS_LOST
1031      * @see TextComponent
1032      * @see javax.swing.text.JTextComponent
1033      * @see AWTPermission
1034      * @see GraphicsEnvironment#isHeadless
1035      * @since 1.4
1036      */
1037     public Clipboard getSystemSelection() throws HeadlessException {
1038         GraphicsEnvironment.checkHeadless();
1039 
1040         if (this != Toolkit.getDefaultToolkit()) {
1041             return Toolkit.getDefaultToolkit().getSystemSelection();
1042         } else {
1043             GraphicsEnvironment.checkHeadless();
1044             return null;
1045         }
1046     }
1047 
1048     /**
1049      * Determines which modifier key is the appropriate accelerator
1050      * key for menu shortcuts.
1051      * <p>
1052      * Menu shortcuts, which are embodied in the
1053      * {@code MenuShortcut} class, are handled by the
1054      * {@code MenuBar} class.
1055      * <p>
1056      * By default, this method returns {@code Event.CTRL_MASK}.
1057      * Toolkit implementations should override this method if the
1058      * <b>Control</b> key isn't the correct key for accelerators.
1059      * @return    the modifier mask on the {@code Event} class
1060      *                 that is used for menu shortcuts on this toolkit.
1061      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1062      * returns true
1063      * @see       java.awt.GraphicsEnvironment#isHeadless
1064      * @see       java.awt.MenuBar
1065      * @see       java.awt.MenuShortcut
1066      * @since     1.1
1067      */
1068     public int getMenuShortcutKeyMask() throws HeadlessException {
1069         GraphicsEnvironment.checkHeadless();
1070 
1071         return Event.CTRL_MASK;
1072     }
1073 
1074     /**
1075      * Returns whether the given locking key on the keyboard is currently in
1076      * its "on" state.
1077      * Valid key codes are
1078      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1079      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1080      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1081      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1082      *
1083      * @param  keyCode the key code
1084      * @return {@code true} if the given key is currently in its "on" state;
1085      *          otherwise {@code false}
1086      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1087      * is not one of the valid key codes
1088      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1089      * allow getting the state of this key programmatically, or if the keyboard
1090      * doesn't have this key
1091      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1092      * returns true
1093      * @see       java.awt.GraphicsEnvironment#isHeadless
1094      * @since 1.3
1095      */
1096     public boolean getLockingKeyState(int keyCode)
1097         throws UnsupportedOperationException
1098     {
1099         GraphicsEnvironment.checkHeadless();
1100 
1101         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1102                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1103             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1104         }
1105         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1106     }
1107 
1108     /**
1109      * Sets the state of the given locking key on the keyboard.
1110      * Valid key codes are
1111      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1112      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1113      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1114      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1115      * <p>
1116      * Depending on the platform, setting the state of a locking key may
1117      * involve event processing and therefore may not be immediately
1118      * observable through getLockingKeyState.
1119      *
1120      * @param  keyCode the key code
1121      * @param  on the state of the key
1122      * @exception java.lang.IllegalArgumentException if {@code keyCode}
1123      * is not one of the valid key codes
1124      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1125      * allow setting the state of this key programmatically, or if the keyboard
1126      * doesn't have this key
1127      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1128      * returns true
1129      * @see       java.awt.GraphicsEnvironment#isHeadless
1130      * @since 1.3
1131      */
1132     public void setLockingKeyState(int keyCode, boolean on)
1133         throws UnsupportedOperationException
1134     {
1135         GraphicsEnvironment.checkHeadless();
1136 
1137         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1138                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1139             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1140         }
1141         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1142     }
1143 
1144     /**
1145      * Give native peers the ability to query the native container
1146      * given a native component (eg the direct parent may be lightweight).
1147      *
1148      * @param  c the component to fetch the container for
1149      * @return the native container object for the component
1150      */
1151     protected static Container getNativeContainer(Component c) {
1152         return c.getNativeContainer();
1153     }
1154 
1155     /**
1156      * Creates a new custom cursor object.
1157      * If the image to display is invalid, the cursor will be hidden (made
1158      * completely transparent), and the hotspot will be set to (0, 0).
1159      *
1160      * <p>Note that multi-frame images are invalid and may cause this
1161      * method to hang.
1162      *
1163      * @param cursor the image to display when the cursor is activated
1164      * @param hotSpot the X and Y of the large cursor's hot spot; the
1165      *   hotSpot values must be less than the Dimension returned by
1166      *   {@code getBestCursorSize}
1167      * @param     name a localized description of the cursor, for Java Accessibility use
1168      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1169      *   the bounds of the cursor
1170      * @return the cursor created
1171      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1172      * returns true
1173      * @see       java.awt.GraphicsEnvironment#isHeadless
1174      * @since     1.2
1175      */
1176     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1177         throws IndexOutOfBoundsException, HeadlessException
1178     {
1179         // Override to implement custom cursor support.
1180         if (this != Toolkit.getDefaultToolkit()) {
1181             return Toolkit.getDefaultToolkit().
1182                 createCustomCursor(cursor, hotSpot, name);
1183         } else {
1184             return new Cursor(Cursor.DEFAULT_CURSOR);
1185         }
1186     }
1187 
1188     /**
1189      * Returns the supported cursor dimension which is closest to the desired
1190      * sizes.  Systems which only support a single cursor size will return that
1191      * size regardless of the desired sizes.  Systems which don't support custom
1192      * cursors will return a dimension of 0, 0. <p>
1193      * Note:  if an image is used whose dimensions don't match a supported size
1194      * (as returned by this method), the Toolkit implementation will attempt to
1195      * resize the image to a supported size.
1196      * Since converting low-resolution images is difficult,
1197      * no guarantees are made as to the quality of a cursor image which isn't a
1198      * supported size.  It is therefore recommended that this method
1199      * be called and an appropriate image used so no image conversion is made.
1200      *
1201      * @param     preferredWidth the preferred cursor width the component would like
1202      * to use.
1203      * @param     preferredHeight the preferred cursor height the component would like
1204      * to use.
1205      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1206      * the Toolkit implementation doesn't support custom cursors.
1207      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1208      * returns true
1209      * @see       java.awt.GraphicsEnvironment#isHeadless
1210      * @since     1.2
1211      */
1212     public Dimension getBestCursorSize(int preferredWidth,
1213         int preferredHeight) throws HeadlessException {
1214         GraphicsEnvironment.checkHeadless();
1215 
1216         // Override to implement custom cursor support.
1217         if (this != Toolkit.getDefaultToolkit()) {
1218             return Toolkit.getDefaultToolkit().
1219                 getBestCursorSize(preferredWidth, preferredHeight);
1220         } else {
1221             return new Dimension(0, 0);
1222         }
1223     }
1224 
1225     /**
1226      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1227      * palette.<p>
1228      * Note: if an image is used which has more colors in its palette than
1229      * the supported maximum, the Toolkit implementation will attempt to flatten the
1230      * palette to the maximum.  Since converting low-resolution images is difficult,
1231      * no guarantees are made as to the quality of a cursor image which has more
1232      * colors than the system supports.  It is therefore recommended that this method
1233      * be called and an appropriate image used so no image conversion is made.
1234      *
1235      * @return    the maximum number of colors, or zero if custom cursors are not
1236      * supported by this Toolkit implementation.
1237      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1238      * returns true
1239      * @see       java.awt.GraphicsEnvironment#isHeadless
1240      * @since     1.2
1241      */
1242     public int getMaximumCursorColors() throws HeadlessException {
1243         GraphicsEnvironment.checkHeadless();
1244 
1245         // Override to implement custom cursor support.
1246         if (this != Toolkit.getDefaultToolkit()) {
1247             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1248         } else {
1249             return 0;
1250         }
1251     }
1252 
1253     /**
1254      * Returns whether Toolkit supports this state for
1255      * {@code Frame}s.  This method tells whether the <em>UI
1256      * concept</em> of, say, maximization or iconification is
1257      * supported.  It will always return false for "compound" states
1258      * like {@code Frame.ICONIFIED|Frame.MAXIMIZED_VERT}.
1259      * In other words, the rule of thumb is that only queries with a
1260      * single frame state constant as an argument are meaningful.
1261      * <p>Note that supporting a given concept is a platform-
1262      * dependent feature. Due to native limitations the Toolkit
1263      * object may report a particular state as supported, however at
1264      * the same time the Toolkit object will be unable to apply the
1265      * state to a given frame.  This circumstance has two following
1266      * consequences:
1267      * <ul>
1268      * <li>Only the return value of {@code false} for the present
1269      * method actually indicates that the given state is not
1270      * supported. If the method returns {@code true} the given state
1271      * may still be unsupported and/or unavailable for a particular
1272      * frame.
1273      * <li>The developer should consider examining the value of the
1274      * {@link java.awt.event.WindowEvent#getNewState} method of the
1275      * {@code WindowEvent} received through the {@link
1276      * java.awt.event.WindowStateListener}, rather than assuming
1277      * that the state given to the {@code setExtendedState()} method
1278      * will be definitely applied. For more information see the
1279      * documentation for the {@link Frame#setExtendedState} method.
1280      * </ul>
1281      *
1282      * @param state one of named frame state constants.
1283      * @return {@code true} is this frame state is supported by
1284      *     this Toolkit implementation, {@code false} otherwise.
1285      * @exception HeadlessException
1286      *     if {@code GraphicsEnvironment.isHeadless()}
1287      *     returns {@code true}.
1288      * @see java.awt.Window#addWindowStateListener
1289      * @since   1.4
1290      */
1291     public boolean isFrameStateSupported(int state)
1292         throws HeadlessException
1293     {
1294         GraphicsEnvironment.checkHeadless();
1295 
1296         if (this != Toolkit.getDefaultToolkit()) {
1297             return Toolkit.getDefaultToolkit().
1298                 isFrameStateSupported(state);
1299         } else {
1300             return (state == Frame.NORMAL); // others are not guaranteed
1301         }
1302     }
1303 
1304     /**
1305      * Support for I18N: any visible strings should be stored in
1306      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1307      * here, so that only one copy is maintained.
1308      */
1309     private static ResourceBundle resources;
1310     private static ResourceBundle platformResources;
1311 
1312     // called by platform toolkit
1313     private static void setPlatformResources(ResourceBundle bundle) {
1314         platformResources = bundle;
1315     }
1316 
1317     /**
1318      * Initialize JNI field and method ids
1319      */
1320     private static native void initIDs();
1321 
1322     /**
1323      * WARNING: This is a temporary workaround for a problem in the
1324      * way the AWT loads native libraries. A number of classes in the
1325      * AWT package have a native method, initIDs(), which initializes
1326      * the JNI field and method ids used in the native portion of
1327      * their implementation.
1328      *
1329      * Since the use and storage of these ids is done by the
1330      * implementation libraries, the implementation of these method is
1331      * provided by the particular AWT implementations (for example,
1332      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1333      * problem is that this means that the native libraries must be
1334      * loaded by the java.* classes, which do not necessarily know the
1335      * names of the libraries to load. A better way of doing this
1336      * would be to provide a separate library which defines java.awt.*
1337      * initIDs, and exports the relevant symbols out to the
1338      * implementation libraries.
1339      *
1340      * For now, we know it's done by the implementation, and we assume
1341      * that the name of the library is "awt".  -br.
1342      *
1343      * If you change loadLibraries(), please add the change to
1344      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1345      * classes can be loaded in java.awt.image that depend on
1346      * libawt and there is no way to call Toolkit.loadLibraries()
1347      * directly.  -hung
1348      */
1349     private static boolean loaded = false;
1350     static void loadLibraries() {
1351         if (!loaded) {
1352             java.security.AccessController.doPrivileged(
1353                 new java.security.PrivilegedAction<Void>() {
1354                     public Void run() {
1355                         System.loadLibrary("awt");
1356                         return null;
1357                     }
1358                 });
1359             loaded = true;
1360         }
1361     }
1362 
1363     static {
1364         AWTAccessor.setToolkitAccessor(
1365                 new AWTAccessor.ToolkitAccessor() {
1366                     @Override
1367                     public void setPlatformResources(ResourceBundle bundle) {
1368                         Toolkit.setPlatformResources(bundle);
1369                     }
1370                 });
1371 
1372         java.security.AccessController.doPrivileged(
1373                                  new java.security.PrivilegedAction<Void>() {
1374             public Void run() {
1375                 try {
1376                     resources = ResourceBundle.getBundle("sun.awt.resources.awt");
1377                 } catch (MissingResourceException e) {
1378                     // No resource file; defaults will be used.
1379                 }
1380                 return null;
1381             }
1382         });
1383 
1384         // ensure that the proper libraries are loaded
1385         loadLibraries();
1386         initAssistiveTechnologies();
1387         if (!GraphicsEnvironment.isHeadless()) {
1388             initIDs();
1389         }
1390     }
1391 
1392     /**
1393      * Gets a property with the specified key and default.
1394      * This method returns defaultValue if the property is not found.
1395      *
1396      * @param  key the key
1397      * @param  defaultValue the default value
1398      * @return the value of the property or the default value
1399      *         if the property was not found
1400      */
1401     public static String getProperty(String key, String defaultValue) {
1402         // first try platform specific bundle
1403         if (platformResources != null) {
1404             try {
1405                 return platformResources.getString(key);
1406             }
1407             catch (MissingResourceException e) {}
1408         }
1409 
1410         // then shared one
1411         if (resources != null) {
1412             try {
1413                 return resources.getString(key);
1414             }
1415             catch (MissingResourceException e) {}
1416         }
1417 
1418         return defaultValue;
1419     }
1420 
1421     /**
1422      * Get the application's or applet's EventQueue instance.
1423      * Depending on the Toolkit implementation, different EventQueues
1424      * may be returned for different applets.  Applets should
1425      * therefore not assume that the EventQueue instance returned
1426      * by this method will be shared by other applets or the system.
1427      *
1428      * <p> If there is a security manager then its
1429      * {@link SecurityManager#checkPermission checkPermission} method
1430      * is called to check {@code AWTPermission("accessEventQueue")}.
1431      *
1432      * @return    the {@code EventQueue} object
1433      * @throws  SecurityException
1434      *          if a security manager is set and it denies access to
1435      *          the {@code EventQueue}
1436      * @see     java.awt.AWTPermission
1437     */
1438     public final EventQueue getSystemEventQueue() {
1439         SecurityManager security = System.getSecurityManager();
1440         if (security != null) {
1441             security.checkPermission(AWTPermissions.CHECK_AWT_EVENTQUEUE_PERMISSION);
1442         }
1443         return getSystemEventQueueImpl();
1444     }
1445 
1446     /**
1447      * Gets the application's or applet's {@code EventQueue}
1448      * instance, without checking access.  For security reasons,
1449      * this can only be called from a {@code Toolkit} subclass.
1450      * @return the {@code EventQueue} object
1451      */
1452     protected abstract EventQueue getSystemEventQueueImpl();
1453 
1454     /* Accessor method for use by AWT package routines. */
1455     static EventQueue getEventQueue() {
1456         return getDefaultToolkit().getSystemEventQueueImpl();
1457     }
1458 
1459     /**
1460      * Creates a concrete, platform dependent, subclass of the abstract
1461      * DragGestureRecognizer class requested, and associates it with the
1462      * DragSource, Component and DragGestureListener specified.
1463      *
1464      * subclasses should override this to provide their own implementation
1465      *
1466      * @param <T> the type of DragGestureRecognizer to create
1467      * @param abstractRecognizerClass The abstract class of the required recognizer
1468      * @param ds                      The DragSource
1469      * @param c                       The Component target for the DragGestureRecognizer
1470      * @param srcActions              The actions permitted for the gesture
1471      * @param dgl                     The DragGestureListener
1472      *
1473      * @return the new object or null.  Always returns null if
1474      * GraphicsEnvironment.isHeadless() returns true.
1475      * @see java.awt.GraphicsEnvironment#isHeadless
1476      */
1477     public <T extends DragGestureRecognizer> T
1478         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1479                                     DragSource ds, Component c, int srcActions,
1480                                     DragGestureListener dgl)
1481     {
1482         return null;
1483     }
1484 
1485     /**
1486      * Obtains a value for the specified desktop property.
1487      *
1488      * A desktop property is a uniquely named value for a resource that
1489      * is Toolkit global in nature. Usually it also is an abstract
1490      * representation for an underlying platform dependent desktop setting.
1491      * For more information on desktop properties supported by the AWT see
1492      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1493      *
1494      * @param  propertyName the property name
1495      * @return the value for the specified desktop property
1496      */
1497     public final synchronized Object getDesktopProperty(String propertyName) {
1498         // This is a workaround for headless toolkits.  It would be
1499         // better to override this method but it is declared final.
1500         // "this instanceof" syntax defeats polymorphism.
1501         // --mm, 03/03/00
1502         if (this instanceof HeadlessToolkit) {
1503             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1504                 .getDesktopProperty(propertyName);
1505         }
1506 
1507         if (desktopProperties.isEmpty()) {
1508             initializeDesktopProperties();
1509         }
1510 
1511         Object value;
1512 
1513         // This property should never be cached
1514         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1515             return getDefaultToolkit().lazilyLoadDesktopProperty(propertyName);
1516         }
1517 
1518         value = desktopProperties.get(propertyName);
1519 
1520         if (value == null) {
1521             value = lazilyLoadDesktopProperty(propertyName);
1522 
1523             if (value != null) {
1524                 setDesktopProperty(propertyName, value);
1525             }
1526         }
1527 
1528         /* for property "awt.font.desktophints" */
1529         if (value instanceof RenderingHints) {
1530             value = ((RenderingHints)value).clone();
1531         }
1532 
1533         return value;
1534     }
1535 
1536     /**
1537      * Sets the named desktop property to the specified value and fires a
1538      * property change event to notify any listeners that the value has changed.
1539      *
1540      * @param  name the property name
1541      * @param  newValue the new property value
1542      */
1543     protected final void setDesktopProperty(String name, Object newValue) {
1544         // This is a workaround for headless toolkits.  It would be
1545         // better to override this method but it is declared final.
1546         // "this instanceof" syntax defeats polymorphism.
1547         // --mm, 03/03/00
1548         if (this instanceof HeadlessToolkit) {
1549             ((HeadlessToolkit)this).getUnderlyingToolkit()
1550                 .setDesktopProperty(name, newValue);
1551             return;
1552         }
1553         Object oldValue;
1554 
1555         synchronized (this) {
1556             oldValue = desktopProperties.get(name);
1557             desktopProperties.put(name, newValue);
1558         }
1559 
1560         // Don't fire change event if old and new values are null.
1561         // It helps to avoid recursive resending of WM_THEMECHANGED
1562         if (oldValue != null || newValue != null) {
1563             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1564         }
1565     }
1566 
1567     /**
1568      * An opportunity to lazily evaluate desktop property values.
1569      * @return the desktop property or null
1570      * @param name the name
1571      */
1572     protected Object lazilyLoadDesktopProperty(String name) {
1573         return null;
1574     }
1575 
1576     /**
1577      * initializeDesktopProperties
1578      */
1579     protected void initializeDesktopProperties() {
1580     }
1581 
1582     /**
1583      * Adds the specified property change listener for the named desktop
1584      * property. When a {@link java.beans.PropertyChangeListenerProxy} object is added,
1585      * its property name is ignored, and the wrapped listener is added.
1586      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1587      * no exception is thrown and no action is performed.
1588      *
1589      * @param   name The name of the property to listen for
1590      * @param   pcl The property change listener
1591      * @see PropertyChangeSupport#addPropertyChangeListener(String,
1592                 PropertyChangeListener)
1593      * @since   1.2
1594      */
1595     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1596         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1597     }
1598 
1599     /**
1600      * Removes the specified property change listener for the named
1601      * desktop property. When a {@link java.beans.PropertyChangeListenerProxy} object
1602      * is removed, its property name is ignored, and
1603      * the wrapped listener is removed.
1604      * If {@code name} is {@code null} or {@code pcl} is {@code null},
1605      * no exception is thrown and no action is performed.
1606      *
1607      * @param   name The name of the property to remove
1608      * @param   pcl The property change listener
1609      * @see PropertyChangeSupport#removePropertyChangeListener(String,
1610                 PropertyChangeListener)
1611      * @since   1.2
1612      */
1613     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1614         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1615     }
1616 
1617     /**
1618      * Returns an array of all the property change listeners
1619      * registered on this toolkit. The returned array
1620      * contains {@link java.beans.PropertyChangeListenerProxy} objects
1621      * that associate listeners with the names of desktop properties.
1622      *
1623      * @return all of this toolkit's {@link PropertyChangeListener}
1624      *         objects wrapped in {@code java.beans.PropertyChangeListenerProxy} objects
1625      *         or an empty array  if no listeners are added
1626      *
1627      * @see PropertyChangeSupport#getPropertyChangeListeners()
1628      * @since 1.4
1629      */
1630     public PropertyChangeListener[] getPropertyChangeListeners() {
1631         return desktopPropsSupport.getPropertyChangeListeners();
1632     }
1633 
1634     /**
1635      * Returns an array of all property change listeners
1636      * associated with the specified name of a desktop property.
1637      *
1638      * @param  propertyName the named property
1639      * @return all of the {@code PropertyChangeListener} objects
1640      *         associated with the specified name of a desktop property
1641      *         or an empty array if no such listeners are added
1642      *
1643      * @see PropertyChangeSupport#getPropertyChangeListeners(String)
1644      * @since 1.4
1645      */
1646     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1647         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1648     }
1649 
1650     /**
1651      * The desktop properties.
1652      */
1653     protected final Map<String,Object> desktopProperties =
1654             new HashMap<String,Object>();
1655     /**
1656      * The desktop properties change support.
1657      */
1658     protected final PropertyChangeSupport desktopPropsSupport =
1659             Toolkit.createPropertyChangeSupport(this);
1660 
1661     /**
1662      * Returns whether the always-on-top mode is supported by this toolkit.
1663      * To detect whether the always-on-top mode is supported for a
1664      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1665      * @return {@code true}, if current toolkit supports the always-on-top mode,
1666      *     otherwise returns {@code false}
1667      * @see Window#isAlwaysOnTopSupported
1668      * @see Window#setAlwaysOnTop(boolean)
1669      * @since 1.6
1670      */
1671     public boolean isAlwaysOnTopSupported() {
1672         return true;
1673     }
1674 
1675     /**
1676      * Returns whether the given modality type is supported by this toolkit. If
1677      * a dialog with unsupported modality type is created, then
1678      * {@code Dialog.ModalityType.MODELESS} is used instead.
1679      *
1680      * @param modalityType modality type to be checked for support by this toolkit
1681      *
1682      * @return {@code true}, if current toolkit supports given modality
1683      *     type, {@code false} otherwise
1684      *
1685      * @see java.awt.Dialog.ModalityType
1686      * @see java.awt.Dialog#getModalityType
1687      * @see java.awt.Dialog#setModalityType
1688      *
1689      * @since 1.6
1690      */
1691     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1692 
1693     /**
1694      * Returns whether the given modal exclusion type is supported by this
1695      * toolkit. If an unsupported modal exclusion type property is set on a window,
1696      * then {@code Dialog.ModalExclusionType.NO_EXCLUDE} is used instead.
1697      *
1698      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1699      *
1700      * @return {@code true}, if current toolkit supports given modal exclusion
1701      *     type, {@code false} otherwise
1702      *
1703      * @see java.awt.Dialog.ModalExclusionType
1704      * @see java.awt.Window#getModalExclusionType
1705      * @see java.awt.Window#setModalExclusionType
1706      *
1707      * @since 1.6
1708      */
1709     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1710 
1711     // 8014718: logging has been removed from SunToolkit
1712 
1713     private static final int LONG_BITS = 64;
1714     private int[] calls = new int[LONG_BITS];
1715     private static volatile long enabledOnToolkitMask;
1716     private AWTEventListener eventListener = null;
1717     private WeakHashMap<AWTEventListener, SelectiveAWTEventListener> listener2SelectiveListener = new WeakHashMap<>();
1718 
1719     /*
1720      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1721      * if the listener is proxied.
1722      */
1723     private static AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1724     {
1725         AWTEventListener localL = l;
1726 
1727         if (localL == null) {
1728             return null;
1729         }
1730         // if user passed in a AWTEventListenerProxy object, extract
1731         // the listener
1732         if (l instanceof AWTEventListenerProxy) {
1733             localL = ((AWTEventListenerProxy)l).getListener();
1734         }
1735         return localL;
1736     }
1737 
1738     /**
1739      * Adds an AWTEventListener to receive all AWTEvents dispatched
1740      * system-wide that conform to the given {@code eventMask}.
1741      * <p>
1742      * First, if there is a security manager, its {@code checkPermission}
1743      * method is called with an
1744      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1745      * This may result in a SecurityException.
1746      * <p>
1747      * {@code eventMask} is a bitmask of event types to receive.
1748      * It is constructed by bitwise OR-ing together the event masks
1749      * defined in {@code AWTEvent}.
1750      * <p>
1751      * Note:  event listener use is not recommended for normal
1752      * application use, but are intended solely to support special
1753      * purpose facilities including support for accessibility,
1754      * event record/playback, and diagnostic tracing.
1755      *
1756      * If listener is null, no exception is thrown and no action is performed.
1757      *
1758      * @param    listener   the event listener.
1759      * @param    eventMask  the bitmask of event types to receive
1760      * @throws SecurityException
1761      *        if a security manager exists and its
1762      *        {@code checkPermission} method doesn't allow the operation.
1763      * @see      #removeAWTEventListener
1764      * @see      #getAWTEventListeners
1765      * @see      SecurityManager#checkPermission
1766      * @see      java.awt.AWTEvent
1767      * @see      java.awt.AWTPermission
1768      * @see      java.awt.event.AWTEventListener
1769      * @see      java.awt.event.AWTEventListenerProxy
1770      * @since    1.2
1771      */
1772     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
1773         AWTEventListener localL = deProxyAWTEventListener(listener);
1774 
1775         if (localL == null) {
1776             return;
1777         }
1778         SecurityManager security = System.getSecurityManager();
1779         if (security != null) {
1780           security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1781         }
1782         synchronized (this) {
1783             SelectiveAWTEventListener selectiveListener =
1784                 listener2SelectiveListener.get(localL);
1785 
1786             if (selectiveListener == null) {
1787                 // Create a new selectiveListener.
1788                 selectiveListener = new SelectiveAWTEventListener(localL,
1789                                                                  eventMask);
1790                 listener2SelectiveListener.put(localL, selectiveListener);
1791                 eventListener = ToolkitEventMulticaster.add(eventListener,
1792                                                             selectiveListener);
1793             }
1794             // OR the eventMask into the selectiveListener's event mask.
1795             selectiveListener.orEventMasks(eventMask);
1796 
1797             enabledOnToolkitMask |= eventMask;
1798 
1799             long mask = eventMask;
1800             for (int i=0; i<LONG_BITS; i++) {
1801                 // If no bits are set, break out of loop.
1802                 if (mask == 0) {
1803                     break;
1804                 }
1805                 if ((mask & 1L) != 0) {  // Always test bit 0.
1806                     calls[i]++;
1807                 }
1808                 mask >>>= 1;  // Right shift, fill with zeros on left.
1809             }
1810         }
1811     }
1812 
1813     /**
1814      * Removes an AWTEventListener from receiving dispatched AWTEvents.
1815      * <p>
1816      * First, if there is a security manager, its {@code checkPermission}
1817      * method is called with an
1818      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1819      * This may result in a SecurityException.
1820      * <p>
1821      * Note:  event listener use is not recommended for normal
1822      * application use, but are intended solely to support special
1823      * purpose facilities including support for accessibility,
1824      * event record/playback, and diagnostic tracing.
1825      *
1826      * If listener is null, no exception is thrown and no action is performed.
1827      *
1828      * @param    listener   the event listener.
1829      * @throws SecurityException
1830      *        if a security manager exists and its
1831      *        {@code checkPermission} method doesn't allow the operation.
1832      * @see      #addAWTEventListener
1833      * @see      #getAWTEventListeners
1834      * @see      SecurityManager#checkPermission
1835      * @see      java.awt.AWTEvent
1836      * @see      java.awt.AWTPermission
1837      * @see      java.awt.event.AWTEventListener
1838      * @see      java.awt.event.AWTEventListenerProxy
1839      * @since    1.2
1840      */
1841     public void removeAWTEventListener(AWTEventListener listener) {
1842         AWTEventListener localL = deProxyAWTEventListener(listener);
1843 
1844         if (listener == null) {
1845             return;
1846         }
1847         SecurityManager security = System.getSecurityManager();
1848         if (security != null) {
1849             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1850         }
1851 
1852         synchronized (this) {
1853             SelectiveAWTEventListener selectiveListener =
1854                 listener2SelectiveListener.get(localL);
1855 
1856             if (selectiveListener != null) {
1857                 listener2SelectiveListener.remove(localL);
1858                 int[] listenerCalls = selectiveListener.getCalls();
1859                 for (int i=0; i<LONG_BITS; i++) {
1860                     calls[i] -= listenerCalls[i];
1861                     assert calls[i] >= 0: "Negative Listeners count";
1862 
1863                     if (calls[i] == 0) {
1864                         enabledOnToolkitMask &= ~(1L<<i);
1865                     }
1866                 }
1867             }
1868             eventListener = ToolkitEventMulticaster.remove(eventListener,
1869             (selectiveListener == null) ? localL : selectiveListener);
1870         }
1871     }
1872 
1873     static boolean enabledOnToolkit(long eventMask) {
1874         return (enabledOnToolkitMask & eventMask) != 0;
1875         }
1876 
1877     synchronized int countAWTEventListeners(long eventMask) {
1878         int ci = 0;
1879         for (; eventMask != 0; eventMask >>>= 1, ci++) {
1880         }
1881         ci--;
1882         return calls[ci];
1883     }
1884     /**
1885      * Returns an array of all the {@code AWTEventListener}s
1886      * registered on this toolkit.
1887      * If there is a security manager, its {@code checkPermission}
1888      * method is called with an
1889      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1890      * This may result in a SecurityException.
1891      * Listeners can be returned
1892      * within {@code AWTEventListenerProxy} objects, which also contain
1893      * the event mask for the given listener.
1894      * Note that listener objects
1895      * added multiple times appear only once in the returned array.
1896      *
1897      * @return all of the {@code AWTEventListener}s or an empty
1898      *         array if no listeners are currently registered
1899      * @throws SecurityException
1900      *        if a security manager exists and its
1901      *        {@code checkPermission} method doesn't allow the operation.
1902      * @see      #addAWTEventListener
1903      * @see      #removeAWTEventListener
1904      * @see      SecurityManager#checkPermission
1905      * @see      java.awt.AWTEvent
1906      * @see      java.awt.AWTPermission
1907      * @see      java.awt.event.AWTEventListener
1908      * @see      java.awt.event.AWTEventListenerProxy
1909      * @since 1.4
1910      */
1911     public AWTEventListener[] getAWTEventListeners() {
1912         SecurityManager security = System.getSecurityManager();
1913         if (security != null) {
1914             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1915         }
1916         synchronized (this) {
1917             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1918 
1919             AWTEventListener[] ret = new AWTEventListener[la.length];
1920             for (int i = 0; i < la.length; i++) {
1921                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1922                 AWTEventListener tempL = sael.getListener();
1923                 //assert tempL is not an AWTEventListenerProxy - we should
1924                 // have weeded them all out
1925                 // don't want to wrap a proxy inside a proxy
1926                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
1927             }
1928             return ret;
1929         }
1930     }
1931 
1932     /**
1933      * Returns an array of all the {@code AWTEventListener}s
1934      * registered on this toolkit which listen to all of the event
1935      * types specified in the {@code eventMask} argument.
1936      * If there is a security manager, its {@code checkPermission}
1937      * method is called with an
1938      * {@code AWTPermission("listenToAllAWTEvents")} permission.
1939      * This may result in a SecurityException.
1940      * Listeners can be returned
1941      * within {@code AWTEventListenerProxy} objects, which also contain
1942      * the event mask for the given listener.
1943      * Note that listener objects
1944      * added multiple times appear only once in the returned array.
1945      *
1946      * @param  eventMask the bitmask of event types to listen for
1947      * @return all of the {@code AWTEventListener}s registered
1948      *         on this toolkit for the specified
1949      *         event types, or an empty array if no such listeners
1950      *         are currently registered
1951      * @throws SecurityException
1952      *        if a security manager exists and its
1953      *        {@code checkPermission} method doesn't allow the operation.
1954      * @see      #addAWTEventListener
1955      * @see      #removeAWTEventListener
1956      * @see      SecurityManager#checkPermission
1957      * @see      java.awt.AWTEvent
1958      * @see      java.awt.AWTPermission
1959      * @see      java.awt.event.AWTEventListener
1960      * @see      java.awt.event.AWTEventListenerProxy
1961      * @since 1.4
1962      */
1963     public AWTEventListener[] getAWTEventListeners(long eventMask) {
1964         SecurityManager security = System.getSecurityManager();
1965         if (security != null) {
1966             security.checkPermission(AWTPermissions.ALL_AWT_EVENTS_PERMISSION);
1967         }
1968         synchronized (this) {
1969             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
1970 
1971             java.util.List<AWTEventListenerProxy> list = new ArrayList<>(la.length);
1972 
1973             for (int i = 0; i < la.length; i++) {
1974                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
1975                 if ((sael.getEventMask() & eventMask) == eventMask) {
1976                     //AWTEventListener tempL = sael.getListener();
1977                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
1978                                                        sael.getListener()));
1979                 }
1980             }
1981             return list.toArray(new AWTEventListener[0]);
1982         }
1983     }
1984 
1985     /*
1986      * This method notifies any AWTEventListeners that an event
1987      * is about to be dispatched.
1988      *
1989      * @param theEvent the event which will be dispatched.
1990      */
1991     void notifyAWTEventListeners(AWTEvent theEvent) {
1992         // This is a workaround for headless toolkits.  It would be
1993         // better to override this method but it is declared package private.
1994         // "this instanceof" syntax defeats polymorphism.
1995         // --mm, 03/03/00
1996         if (this instanceof HeadlessToolkit) {
1997             ((HeadlessToolkit)this).getUnderlyingToolkit()
1998                 .notifyAWTEventListeners(theEvent);
1999             return;
2000         }
2001 
2002         AWTEventListener eventListener = this.eventListener;
2003         if (eventListener != null) {
2004             eventListener.eventDispatched(theEvent);
2005         }
2006     }
2007 
2008     private static class ToolkitEventMulticaster extends AWTEventMulticaster
2009         implements AWTEventListener {
2010         // Implementation cloned from AWTEventMulticaster.
2011 
2012         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2013             super(a, b);
2014         }
2015 
2016         @SuppressWarnings("overloads")
2017         static AWTEventListener add(AWTEventListener a,
2018                                     AWTEventListener b) {
2019             if (a == null)  return b;
2020             if (b == null)  return a;
2021             return new ToolkitEventMulticaster(a, b);
2022         }
2023 
2024         @SuppressWarnings("overloads")
2025         static AWTEventListener remove(AWTEventListener l,
2026                                        AWTEventListener oldl) {
2027             return (AWTEventListener) removeInternal(l, oldl);
2028         }
2029 
2030         // #4178589: must overload remove(EventListener) to call our add()
2031         // instead of the static addInternal() so we allocate a
2032         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2033         // Note: this method is called by AWTEventListener.removeInternal(),
2034         // so its method signature must match AWTEventListener.remove().
2035         protected EventListener remove(EventListener oldl) {
2036             if (oldl == a)  return b;
2037             if (oldl == b)  return a;
2038             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2039             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2040             if (a2 == a && b2 == b) {
2041                 return this;    // it's not here
2042             }
2043             return add(a2, b2);
2044         }
2045 
2046         public void eventDispatched(AWTEvent event) {
2047             ((AWTEventListener)a).eventDispatched(event);
2048             ((AWTEventListener)b).eventDispatched(event);
2049         }
2050     }
2051 
2052     private class SelectiveAWTEventListener implements AWTEventListener {
2053         AWTEventListener listener;
2054         private long eventMask;
2055         // This array contains the number of times to call the eventlistener
2056         // for each event type.
2057         int[] calls = new int[Toolkit.LONG_BITS];
2058 
2059         public AWTEventListener getListener() {return listener;}
2060         public long getEventMask() {return eventMask;}
2061         public int[] getCalls() {return calls;}
2062 
2063         public void orEventMasks(long mask) {
2064             eventMask |= mask;
2065             // For each event bit set in mask, increment its call count.
2066             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2067                 // If no bits are set, break out of loop.
2068                 if (mask == 0) {
2069                     break;
2070                 }
2071                 if ((mask & 1L) != 0) {  // Always test bit 0.
2072                     calls[i]++;
2073                 }
2074                 mask >>>= 1;  // Right shift, fill with zeros on left.
2075             }
2076         }
2077 
2078         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2079             listener = l;
2080             eventMask = mask;
2081         }
2082 
2083         public void eventDispatched(AWTEvent event) {
2084             long eventBit = 0; // Used to save the bit of the event type.
2085             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2086                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2087                  event.id <= ComponentEvent.COMPONENT_LAST)
2088              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2089                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2090                  event.id <= ContainerEvent.CONTAINER_LAST)
2091              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2092                  event.id >= FocusEvent.FOCUS_FIRST &&
2093                  event.id <= FocusEvent.FOCUS_LAST)
2094              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2095                  event.id >= KeyEvent.KEY_FIRST &&
2096                  event.id <= KeyEvent.KEY_LAST)
2097              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2098                  event.id == MouseEvent.MOUSE_WHEEL)
2099              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2100                  (event.id == MouseEvent.MOUSE_MOVED ||
2101                   event.id == MouseEvent.MOUSE_DRAGGED))
2102              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2103                  event.id != MouseEvent.MOUSE_MOVED &&
2104                  event.id != MouseEvent.MOUSE_DRAGGED &&
2105                  event.id != MouseEvent.MOUSE_WHEEL &&
2106                  event.id >= MouseEvent.MOUSE_FIRST &&
2107                  event.id <= MouseEvent.MOUSE_LAST)
2108              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2109                  (event.id >= WindowEvent.WINDOW_FIRST &&
2110                  event.id <= WindowEvent.WINDOW_LAST))
2111              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2112                  event.id >= ActionEvent.ACTION_FIRST &&
2113                  event.id <= ActionEvent.ACTION_LAST)
2114              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2115                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2116                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2117              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2118                  event.id >= ItemEvent.ITEM_FIRST &&
2119                  event.id <= ItemEvent.ITEM_LAST)
2120              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2121                  event.id >= TextEvent.TEXT_FIRST &&
2122                  event.id <= TextEvent.TEXT_LAST)
2123              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2124                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2125                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2126              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2127                  event.id >= PaintEvent.PAINT_FIRST &&
2128                  event.id <= PaintEvent.PAINT_LAST)
2129              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2130                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2131                  event.id <= InvocationEvent.INVOCATION_LAST)
2132              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2133                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2134              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2135                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2136                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2137              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2138                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2139              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2140                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2141                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2142                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2143                     (event instanceof sun.awt.UngrabEvent))) {
2144                 // Get the index of the call count for this event type.
2145                 // Instead of using Math.log(...) we will calculate it with
2146                 // bit shifts. That's what previous implementation looked like:
2147                 //
2148                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2149                 int ci = 0;
2150                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2151                 }
2152                 ci--;
2153                 // Call the listener as many times as it was added for this
2154                 // event type.
2155                 for (int i=0; i<calls[ci]; i++) {
2156                     listener.eventDispatched(event);
2157                 }
2158             }
2159         }
2160     }
2161 
2162     /**
2163      * Returns a map of visual attributes for the abstract level description
2164      * of the given input method highlight, or null if no mapping is found.
2165      * The style field of the input method highlight is ignored. The map
2166      * returned is unmodifiable.
2167      * @param highlight input method highlight
2168      * @return style attribute map, or {@code null}
2169      * @exception HeadlessException if
2170      *     {@code GraphicsEnvironment.isHeadless} returns true
2171      * @see       java.awt.GraphicsEnvironment#isHeadless
2172      * @since 1.3
2173      */
2174     public abstract Map<java.awt.font.TextAttribute,?>
2175         mapInputMethodHighlight(InputMethodHighlight highlight)
2176         throws HeadlessException;
2177 
2178     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2179         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2180             return new DesktopPropertyChangeSupport(toolkit);
2181         } else {
2182             return new PropertyChangeSupport(toolkit);
2183         }
2184     }
2185 
2186     @SuppressWarnings("serial")
2187     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2188 
2189         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2190                 new StringBuilder("desktop property change support key");
2191         private final Object source;
2192 
2193         public DesktopPropertyChangeSupport(Object sourceBean) {
2194             super(sourceBean);
2195             source = sourceBean;
2196         }
2197 
2198         @Override
2199         public synchronized void addPropertyChangeListener(
2200                 String propertyName,
2201                 PropertyChangeListener listener)
2202         {
2203             PropertyChangeSupport pcs = (PropertyChangeSupport)
2204                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2205             if (null == pcs) {
2206                 pcs = new PropertyChangeSupport(source);
2207                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2208             }
2209             pcs.addPropertyChangeListener(propertyName, listener);
2210         }
2211 
2212         @Override
2213         public synchronized void removePropertyChangeListener(
2214                 String propertyName,
2215                 PropertyChangeListener listener)
2216         {
2217             PropertyChangeSupport pcs = (PropertyChangeSupport)
2218                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2219             if (null != pcs) {
2220                 pcs.removePropertyChangeListener(propertyName, listener);
2221             }
2222         }
2223 
2224         @Override
2225         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2226         {
2227             PropertyChangeSupport pcs = (PropertyChangeSupport)
2228                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2229             if (null != pcs) {
2230                 return pcs.getPropertyChangeListeners();
2231             } else {
2232                 return new PropertyChangeListener[0];
2233             }
2234         }
2235 
2236         @Override
2237         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2238         {
2239             PropertyChangeSupport pcs = (PropertyChangeSupport)
2240                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2241             if (null != pcs) {
2242                 return pcs.getPropertyChangeListeners(propertyName);
2243             } else {
2244                 return new PropertyChangeListener[0];
2245             }
2246         }
2247 
2248         @Override
2249         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2250             PropertyChangeSupport pcs = (PropertyChangeSupport)
2251                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2252             if (null == pcs) {
2253                 pcs = new PropertyChangeSupport(source);
2254                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2255             }
2256             pcs.addPropertyChangeListener(listener);
2257         }
2258 
2259         @Override
2260         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2261             PropertyChangeSupport pcs = (PropertyChangeSupport)
2262                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2263             if (null != pcs) {
2264                 pcs.removePropertyChangeListener(listener);
2265             }
2266         }
2267 
2268         /*
2269          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2270          * use this method.  If this will be changed we will need to change this class.
2271          */
2272         @Override
2273         public void firePropertyChange(final PropertyChangeEvent evt) {
2274             Object oldValue = evt.getOldValue();
2275             Object newValue = evt.getNewValue();
2276             String propertyName = evt.getPropertyName();
2277             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2278                 return;
2279             }
2280             Runnable updater = new Runnable() {
2281                 public void run() {
2282                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2283                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2284                     if (null != pcs) {
2285                         pcs.firePropertyChange(evt);
2286                     }
2287                 }
2288             };
2289             final AppContext currentAppContext = AppContext.getAppContext();
2290             for (AppContext appContext : AppContext.getAppContexts()) {
2291                 if (null == appContext || appContext.isDisposed()) {
2292                     continue;
2293                 }
2294                 if (currentAppContext == appContext) {
2295                     updater.run();
2296                 } else {
2297                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2298                     SunToolkit.postEvent(appContext, e);
2299                 }
2300             }
2301         }
2302     }
2303 
2304     /**
2305     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2306     * {@code EventQueue}.
2307     * <br>
2308     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2309     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2310     * startup by the following command:
2311     * <pre>
2312     * java -Dsun.awt.enableExtraMouseButtons=false Application
2313     * </pre>
2314     * Alternatively, the property could be set in the application by using the following code:
2315     * <pre>
2316     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2317     * </pre>
2318     * before the {@code Toolkit} class initialization.
2319     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2320     * initialized with {@code true}.
2321     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2322     *
2323     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2324     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2325     *         {@code false} otherwise
2326     * @see System#getProperty(String propertyName)
2327     * @see System#setProperty(String propertyName, String value)
2328     * @see java.awt.EventQueue
2329     * @since 1.7
2330      */
2331     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2332         GraphicsEnvironment.checkHeadless();
2333 
2334         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2335     }
2336 }